package com.itheima.reggie.service.impl;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.itheima.reggie.common.CustomException;
import com.itheima.reggie.entity.Category;
import com.itheima.reggie.entity.Dish;
import com.itheima.reggie.entity.Setmeal;
import com.itheima.reggie.mapper.CategoryMapper;
import com.itheima.reggie.service.CategoryService;
import com.itheima.reggie.service.SetmealService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

@Service
public class CategoryServiceImpl extends ServiceImpl<CategoryMapper, Category> implements CategoryService {
    @Autowired
    private DishServiceImpl dishService;
    @Autowired
    private SetmealService setmealService;

    /**
     * 根据id删除分类，删除之前需要进行判断
     * @param id
     */
    @Override
    public void remove(Long id) {

        LambdaQueryWrapper<Dish> dishQueryWrapper = new LambdaQueryWrapper();
        dishQueryWrapper.eq(Dish::getCategoryId,id);
        int dishCount = dishService.count(dishQueryWrapper);

        //查询当前分类是否关联的菜品，如果已经关联，则抛出一个异常
        if (dishCount > 0){
            //已经关联，则抛出一个异常
            throw new CustomException("当前分类下关联的菜品，不能删除");
        }

        //查询当前分类是否关联的套餐，如果已经关联，则抛出一个异常
        LambdaQueryWrapper<Setmeal> setmealQueryWrapper = new LambdaQueryWrapper();
        setmealQueryWrapper.eq(Setmeal::getCategoryId,id);
        int setCount = setmealService.count(setmealQueryWrapper);
        if (setCount>0){
            //已经关联，则抛出一个异常
            throw new CustomException("当前分类下关联的套餐，不能删除");
        }

        //删除分类
        if (dishCount==0&&setCount==0){
            super.removeById(id);
        }

    }
}
